<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS实例</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <p class="c1">11111111111111111</p>
    <p >22222222222222222</p>
    <p id="p3" class ="c1">33333333333333333</p>
</body>
</html>